it. >> "boston globe" reporter steve silva was at the starting line of the day's biggest event, the boston marathon. >> since 1897. >> it was a chilly morning, 30 degrees, people starting to warmup, unlike last year where it was 80 degrees. the weather's not going to be a story this year. what's going to be the story. >> for natalie stavas, a pediatric resident, it would be the story of giving back. >> it was a very special day for me. i had decided to raise money for boston medical center pediatrics. >> doctors told chris that this was a day her daughter might not ever live to see. >> they said her prognosis was, you know, maybe she'll be 10 if we were lucky. >> the mitochondrial disease that weakened her cells made her terribly ill. >> those first few years were hard, she needed to have medical procedures, time in the hospital, lots of pneumonias. >> are to the kay girls, kayla's health challenges, benign tumors, the laws of kayla's father, chris' husband to a heart attack at age 42. but this would be a joyful day. a day to make history as a mother-daughter, wheelchair team.